 It wouldn't be considered rude behavior if he doesn't even take a single drop . But he'd better receive the teacup with both hands and bow his thanks when the cup is brought before his face . When the host pours hot water into his cup , he may also choose to tap his index finger on the table , meaning " Thanks " . No matter if he likes it or not , it is impolite if he doesn't even lay a finger on the cup . 
 So next time , I'd better take a few sips , to ' save face ' at least , right ? 